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%401* 11-W 2.0 REMOVAL ACTIVITIES Kleenco performed the UST removal activities in accordance with rules and regulations set forth by the County of San Joaquin Health Services Agency, Department of Environmental Health (DEH). The California Board of Equalization Fuel Tax Division tank registration number is TK HQ 44-037860. The UST Closure Plan form was completed and submitted to the DEH prior to closure activities. Field activities associated with the UST removal were initiated on August 17, 1998. Permits required for tank closure are provided in Appendix B. Prior to commencement of the removal process, the bulk of used oil was removed from the tank by Asbury Environmental located in San Diego, California. The overburden above the tank was removed both manually and with a backhoe to expose the tank. The overlying concrete was approximately 12 inches thick and was broken up and taken to a local recycling facility. Prior to removal, an inert atmosphere was created in the tank by introduction of dry ice (CO2) at a rate of 1.5 pounds per 100 gallons of tank capacity. The atmosphere inside the tank was checked with a combustible gas indicator (CGI) to measure the lower explosive limit (LEL) inside the tank. The tank registered zero percent LEL and 10.8 percent oxygen. Permission from Mr. Steve Sasson, County of San Joaquin DEH, was given to remove the UST. The 1,000 gallon capacity used oil UST and associated piping were removed from the excavation and inspected for evidence of cracks, breaches, or other failures. No evidence of a breach was observed in the UST or associated piping. Labeling on the tank ends revealed: double-walled tank, 1000 gallons, UL #38935, net 2560 lbs weight, and dry 950 lbs weight. The tank was transported intact by Dexanna LTD of Concord, California to Erickson, Inc. of Richmond, California as a non-RCRA hazardous waste (waste manifest#96633417) for destruction. The tank was cleaned, triple rinsed, and scrapped as non-hazardous waste, and the sludge was drummed and disposed properly by Dexanna LTD. Destruction and disposal documentation are included in Appendix C. The dimensions of the UST excavation at the time of backfilling were 15 feet by 15 feet by 8 feet in depth. Excavated backfill and native soils surrounding the excavation displayed no evidence of contamination. A 12 inch concrete pad was located at the base of the excavation at a depth of 9 feet below grade. A concrete coring machine was used to core through the concrete pad for soil WAL-MART 42025 98I82304.236 2-1 TRACY,CALIFORNIA